$(document).ready(function(){  

    $("ul.head_menu_subnav").parent().append("<span></span>"); //Only shows drop down trigger when js is enabled (Adds empty span tag after ul.subnav*)  

    $("ul.head_menu_nav li span").click(function() { //When trigger is clicked...  

        //Following events are applied to the subnav itself (moving subnav up and down)  
        $(this).parent().find("ul.head_menu_subnav").slideDown('fast').show(); //Drop down the subnav on click  

        $(this).parent().hover(function() {  
        }, function(){  
            $(this).parent().find("ul.head_menu_subnav").slideUp('slow'); //When the mouse hovers out of the subnav, move it back up  
        });  

        //Following events are applied to the trigger (Hover events for the trigger)  
        }).hover(function() {  
            $(this).addClass("subhover"); //On hover over, add class "subhover"  
        }, function(){  //On Hover Out  
            $(this).removeClass("subhover"); //On hover out, remove class "subhover"  
    });  

});  